Air-tight joint for twyers



W.GRAHAM..

TWYER.

Patented Aug. 5, 1851.

UNITED STATES PATENT OFFICE.

WM. GRAHAM, OF GARLISLE, PENNSYLVANIA.

AIR-TIGHT JOINT FOB TWYERS.

Specification of Letters Patent No. 8,268, dated August 5, 1851.

T 0 all whom it may concern Be it known that I, VILLIAM GRAHAM,(blacksmith,) of Carlisle, in the county of Cumberland and State ofPennsylvania, have invented a new and useful Il'nprovement in Twyers;and I do hereby declare the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, making a part thereof, in which that portion of Figure 1,above the red line in, 00, represents a top view; and that portion belowthe red line, a bottom view of the twyer. F1g. 2, represents a sectionthrough the red line :22, w, of Fig. 1. Fig. 3, represents one of thedrop plugs, for closing the openings in the top of the twyer, when thewhole blast 1s not required. Fig. t represents one of the bolts forsecuring the top plate to the bottom of the twyer, and Fig. 5, thehandle for operating the slide on the bottom of the twyer.

Similar letters in the several figures represent the same parts.

The nature of my invention consists in the arrangement of the inner andouter beads on the top plate, between which is placed clay or otherplastic materlal, and the grooves in the edges of the s des of thetwyer, for the purpose of making an a1r tight joint, the whole beingsecured by bolts with projections upon them catching over a cam, cast onthe flanges on the under plate.

To enable others skilled in the art to make and use my invention, I willproceed to describe the same with reference to the draw- The body of thetwyer A, is cast in a square box-shaped form, and the bottom B, thereof,has its sides so inclined toward each other as to form a hopper intowhich the dust, ashes, slag &c., falling through the blast openings willcollect. Through the bottom of this hopper, is an opening a, which hasits sides beveled from the inside to the outside thereof, leaving on theoutside a sharp edge, and over said opening, on the outside of the twyeris a slide 0, which has its edge beveled off from the outside to theinside, so as to form with the beveled edge of the opening a, shears forcutting oft the slag which passes through the twyer after a heavy blast,and allows said slide to make with the bottom of the twyer an air tightjoint. The slide C, is secured at its rear end by a bolt or rivet D,upon which it may swing, and secured to the slide by the same rivet is aspring Z), which projects to nearly the front of the slide, and holds itfirmly, up against the bottom of the twyer. The sides of the twyer arevertical, and on the top edge of said sides are cut-the grooves o, for apurpose which will be hereafter described.

On the bottom plate B, are cast flanges E,

through the holes (Z, in which pass bolts,-

which secures the twyer in its bed on the hearth. There are also throughsaid flanges holes which have a slot f, which are cut through the bottomplate meeting them, for the purpose of passing through said holes, andslot, the bolt F, and its projection or arm 9, and on the underside ofsaid flanges E, and around the holes is cast a can1,over which the arm9", of the bolt catches, and draws down firmly the top plate (to behereafter described) so as to make a close joint.

The funnel G, of the twyer, which is cast with the main body thereof,has a slight inclination upward, so as to be adapted to the nozzle of anordinary bellows, which has a similar inclination in a contrarydirection, and which allows the twyer to lie perfect-1y level on thehearth.

The top plate of the twyer is cast separate, and has upon its four sidesthe lugs H, through which are slotted holes h, similar to, and soarranged as that any two of them will stand directly over the holes inthe flange on the bottom, and through said holes and slots pass thebolts and their arms or projections 9, before described, said armscatching over the cams on the bottom plate, and by turning said boltsthe top and bottom parts are drawn firmly together. These bolts arefound to be a much better fastening than screw bolts, or keyed-bolts,for the latter by the action of the fire becomes so cemented as to makethem very difficult to be removed. By making the twyer square, the topplate can be turned, so as to bring the blast openings into convenientposition for making a long or broad heat, as may be desirable.

On the underside of the top plate are double beads or projections 2',between which the sides of the body of the twyer come, and between whichbeads, when the twyer is to be put together is placed clay or othermaterial, so that when the top and bottom of the twyer is drawn closelytogether by the bolts F, the clay will fill up the groove 0, in

the top of the sides, and the space'between the beads 2', and the sidesof the twyer, so as to make an air tight connection.

011 top of the twyer is an elevation I, which is divided by threewedge-shaped partitions J, and which forms the conical chambers K,through the holes j, in which the blast issues. The sides is, of theconical chambers K, project downward below the general line of the topof the twyer, so as to present a larger opening in the interior, for thepurpose of taking in a larger body of air, and as the chamber K,gradually diminishes toward the exit j, the blast is contracted andissues with greater force. The spaces 5, between the openings 7', in thetop of the t-wyer are grooved out so as to allow the dust, ashes &c., toslide off from said openings, instead of falling into the interior ofthe twyer.

L, Fig. 3, represent drop plugs which may be inserted from the outsideinto the openings 3', when the whole blast is not required for instancein heating light work. These drop plugs are provided with a flange m, soas to catch over the tops of the openings aforesaid, to prevent theplugs from falling through, and to stop any air from issuing throughsaid openings.

On the slide G, underneath, is cast a double headed lug a, over which isplaced an opening 0, in the end of the handle M, Fig. 5, for the purposeof moving the slide to cleanse the twyer, and which may be readilydetached when notrequired for that purpose.

Having thus fully described my invention, what I claim therein as new,and desire to secure by Letters Patent is The combination of the innerand outer beads on the top plate, between which is placed clay or otherplastic material, and

the grooves in the edges of the sides of the twyer for the purpose ofmaking an air tight joint, the whole being secured by bolts with aprojection upon them catching over a cam cast on flanges on the underplate as herein described and represented.

WM. GRAHAM. WVitnesses:

T. C. DONN, A. B. HOUGHTON.

